Rock drill



w. Af SMITH.

RocK DRILL. APPLICATION FILED OCT. 18, 1917.

Patented Aug. L 1922.

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WILLIAM A. SMITH, OF DENVER, COLORADO, ASSIGNOR TO TEE DENVER ROCK DRILL MNUFACTUBJNG CMPANY, OF DENVER, OOLODO, A CORPORATEON 0F DELA- wenn.

ROCK DRILL.

Leeg-edge.,

Speefzcaton of Letters Patent.

Patented fitug.. il, 1922.,

T all 'Lv/7mm t may concern.

Be it known that l, 'lJlTiLipiAM A. Sarria-I, a citizen of the United States, residingat Denver, in the county ot Denver and lState of Colorado, have invented certain new and useful improvements in Rock Drills, ot which the following is a specification.

'Phe n t invention relates to roclr i presen drills in which expansible fluid,` preferably air, is used as the actuating medium, and one of the primary objects is to provide novel means which will allow substantially the complete exhaust ot' the 'fluid preferably on its forward stroke to avoid any cushioning effect, and thus secure an exceedingly heavy blow upon the tool.

A :further and important object is to provide means of a simple and effective nature for introducing a cleansing fluid, such as water, into the front end 0i? the machine, and directing it therethrough to the drill bit, this means being so constructed that it will eilectively prevent the leakage et' liquid into the motor.

One embodiment of the invention illustrated in the accompanying drawings, wherein li1 igriire l isa longitudinal sectional view through. the drillingr apparatus.

Figure 2 is a plan view partly in section.

Figure 3 is an enlarged view showingl in detail t-hc supplemental exhaust passageway and the controlling means therefor.

Figure l is a detail view illustrating,` the head plate and. collar slightly `separated to indicate the initial 'form of the gasket clamped therebetween.

Similar reference numerals designate corresponding' parts in all the figures oi' the drawings.

ln the embodiment illustrated the drilling motor consists ot a cylinder member having' a barrel 5 provided with a piston chamber G, said barrel having' a rear head 7 proif'idcd with a neck chamber A hammer piston is employed, comprisinea head 9 operating in the. chamber 6, said head having an integral rearwardly extendingr neck l0i operat.

ine' in the chamber 8.

Motive iuid is supplied to the machine through a nipple 11 connected to one end of a valve easing 12, in which is located a rotatable throttle valve 13 having a supply port 14 movable into and out of register with a passage 15 that leads to chamber 16 ab the rear end of' the hammer piston. From this chamber 1G, a passageway 1.7 leads to the liront end ot' the neck chamber' 8, and the nce-k 10 is provided with a reduced portion 17S located just in rear of the head E). It will be evident that when the hammer piston is in its rearward position and the valve 125 is open, the motive duid will pass through the chamber 16 and passageway 17 around the 2groove 18, and thus operate against the rear tace of the head 9. This pressure added to the constant pressure against the rear end of the neck 1G, drives the hammer piston forwardly. Another passageway 19, communicatino' with the neck chamber 8 in rear of the front end of the passageway 17, also is in communication with the front end or the chamber 6, and the rear end of the passageway 19 is so situated `that when the piston is in its forward position, the rear end of.: the neck 10 will uncover the rear end of said passaksgeway 19, thus permitting; the motive fluid to flow intothe iront end of the piston chamber 6 and against the 'liront face ot the head 9, thereby driving the hammer piston rearwardly. Communicating with an intermediate portion ot the chamber is an eX- haast passano 20 leading to the atmosphere, and as the head@ passes the inner end oit said. passageway 20, it will be obvious that the motive fluid will exhaust alternately 'from the piston chamber (5 on opposite sides olf-said head 9.

` inasmuch as the inner end or port ot the passageway 2O is necessarily placed at some distance from the front end et the piston chamber G, it will be obvious that after the `liront end of the head 9 passes the exhaust port, pressure would be built up in the liront end ot the chamber 6, thereby producingr a cushion that would weaken the blow ot the hammer piston. ToK obviate this a supple- .mental exhaust passageway 21 is provided, having its inner end communicating by means of a port 22 with. the iront end of the piston chamber, its other endpreferably opening into the exhaust passage 20. ln the passageway 2l is located a. valve seat 23l against which a ball valve 24 is adapted to seat itself. The valve 24, it will be noted, is an outwardly closingl valve, and it is normally held in open position by a coiled spring 25 located in the passageway 21 and abutting against said valve. A plug 26 closing the fron-t end or the passageway 21, has.

a stop 27 against which the valve 24 abuts, and this plug 26 has an exposed head 28.

The spring is of such tension or strength that it will hold the valve 24 1n open condition against the pressure of the normal exhaust, and therefore after the piston head 9 has passed the main exhaust 2O,v

the motiveliuid inl advance lof the same can freely pass through the port 22 around the valve23 and out of the passageway 2l. As soon, however, as. the motive fluid is ad-` mitted to the frontend ofthe piston chamber 6 through the passageway 19, this increased pressure will overcome the force of the spring 25, the valve 24 will seat itself, and the exhaust` will consequently be cut ofi'.

The front head'of the cylinder member is sectional. It comprises a head plate 29 that constitutes a closure for the front end `of the piston chamber. 6.,` and has a flange 30 that abuts against the: front endv ofthe barrel 5, and against the head` 28I of the plug 26, thereby holding the latter in place. In front of theheajd plate'29 is a collar 31, and

in advance of .said collar is,V located a'chuck.

sleeve 32 having a bushing 33 provided with an angular socket34 to receive a drill bit shownY at 35. Thedrill bit is provided. with the usualbore36 longitudinally therethrough. A, tappet is located in this head for transmitting the blow from the hammer piston 9 to the drill bit35. Said tappet consists of a head361` located in the k'collar 31 and a rearwardly extending neck 37 that passes, through the; head plate 30 into the piston chamber 6, whereit will be struck by thehammer piston.r

t In order to supply cleansinguid, areferably water to the bore 3.6 of the drill bit 35, this tappet is; provided with an axial passageway 38,. thefront end; of which communicates with the bore 36, the rear yend being in communication with a lateral port 39 that opensk through the side of the tappet at the juncture of the head 36a` and neck.

, The collar 3l has an annular `channel 40 `with whichA the outer end of the port 39 communicates, and this channel is in communication with the bore 4()a of a supply nipple 41 formed upon one side of theicollar 3l. Liquid from any suitable source can be supplied to a hose connected to the nipple 4l, and it will be evident that this liquid will flow freelyl through the bore 40, port 39, channel 40, and bore 36 of the drill steel to the bottom of the -hole being drilled, to eject the cuttings. s

\ One of the serious difliculties that has been experienced in supplying a cleansing liquid to. the front end of the machine has. been due` to the leakageof said liquid. In the; present` structure. to prevent this, the

s collar- 31 is provided inA its end withtapered grooves 42.; in which' are placed. packing gaskets 4,3.,thatrespectively surroundy theV than` thc sockets containing them, so that' when the parts are drawn together, they will be compressed and forced snugly against the surface. of the tappet. This compressing action issecured by` the side bolts r44, the front ends of which are en-A gaged in ears/45 on the chuck sleeve 32, the side bolts serving to draw the parts. of the front head together and also` clamp said head upon the. barrel. caution against leakage of the liquid rearwardly into the motor, the head plate 30 isl provided` with ank internal channel 4,6 that surrounds the neck 37 of the tappet in rear of the rear gasket and in rear of the channel 40. This channel 46 constitutes a drainand has an outlet port 47 leading to the lexteriorof the machine. Therefore any;

moisture that may pass the rear gasket will be caught in the channel and the leakage of the motive fluid forwardly around the tappet will drive the same out rthrough the port 47. i

F rom the foregoing itis thought thatthe construction, operation and many advantages of the herein described invention will be apparent to those skilled in the art, without further description, and it will be understood that various changes in the size, shape, proportion and minor details of con struction may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention. v'

Having thus fully described my invention, what I claim asnew, and desire to secure by Letters Patent, is

l. In apparatus of the character set forth, the combination with a motor having a barrel, a hammer and a drill receiving chuck, of an exposed collar interposed between the front end of the barrel and the rear end of the drill receiving chuck, a tappet in the collar for transmitting the blows of the hannner to a tool in the chuck and also directing cleansing fluid to such tool, side bolts` connecting the. chuck and motor for clamping As a further pre-` member for the barrel extending in advance thereof and comprising a head plate, a tool supporting chuck and a collar interposed be? tween the head plate and chuck and having an exposed portion provided with means for the attachment thereto of a supply conduit, said collar havinga bore, the end portions of which are of different diameters, a tappet in the collar having a head in the portion of larger diameter and a reduced neck in the portion of smaller diameter, said tappet having` a lateral :inlet port between its ends, packing` gaskets interposed between the head plate and collar and between the collar and clulck, and respectively engaging the neck and head of the tappet on opposite sides of the inlet port, and means for drawing together said head plate, collar and chuck.

ln apparatus of the character set forth, the combination with a motor barrel, of a hammer piston therein, a sectional head member for the barrel, comprising a head plate, a tool holding chuck sleeve and a collar interposed between the head plate and chuck sleeve, a tappet in the collar for operating on a tool supported by the chuck sleeve and having a delivery passageway and a lateral intake port, said collar having a supply port in communication with the intake port` packing for the tappet interposed between the head plate and collar and also between the collar and chuck sleeve, said packing respectively engaging the tappet in advance of and in rear of the supply and intake ports, and means for drawing together said head plate, collar and chuck.

et. In apparatus of the character set forth, the combination with a motor barrel, of a hammer piston therein, a sectional head member for the barrel, comprising a head plate, a chuck sleeve and a collar interposed between the head plate and chuck sleeve, a tappet having an enlarged head in the collar and a reduced neck in the head plate, a pack* ing gasket interposed between the head plate and collar and surrounding the tappet neck, a packing gasket interposed between the collar and chuck sleeve and surrounding` the tappet head, said tappet having a forwardly delivering cleansing fluid passage and a lateral port opening at the juncture of the head and neck, said collar having a supply passage communicating with the tappet passage, and side bolts engaged with the chuck sleeve and clamping the elements of the head member together and to the barrel.

In apparatus of the character set forth, the combination with a motor barrel, of a hammer piston therein, a sectional head member for the barrel comprising a head plate, a tool supporting chuck and a collar interposed between the head plate and chuck and provided with means for the attachment thereto of a supply conduit, said collar having a bore, the end portions of which are of different diameters, a tappet in the collar having a head in the portion of larger diameter and a reduced neck in the portion of smaller diameter, said tappet having a lateral inlet port between its ends, packing gaskets interposed between the head plate and collar and between the collar and chuck and respectively engaging the neck and head of the tappeton opposite sides of the inlet port, the opposing end faces of said collar, head plate and chuck being oppositely inclined forming sockets that flare inwardly to receive the outer portions of the gaskets and forcing said gaskets inwardly when the said parts are drawn together, and means for drawing together said head plate, collar and chuck.

6. ln apparatus of the character set forth, the combination with a motor, of a head member therefor, comprising a head plate and a collar in advance of the same, a tappet operating in the head member and having an inlet port, means on the collar for supplying cleansing Huid to the intake port, and a drain channel in the head plate surrounding the tappet and having an outlet port.

7. ln apparatus of the character set forth, the combination with a barrel, of a hammer piston therein, a head member for the barrel, comprising a head plate, a chuck sleeve and a collar interposed between the chuck sleeve and head plate, side bolts engaged with the chuck sleeve for clamping the parts of the head member together, a tappet in the head member, packing gaskets for the tappet respectively interposed between the chuck sleeve, the collar and the head plate, said tappet having a forwardly delivering fluid passage and a lateral intake port, said collar having a supply passage communicating with the intake port between the packing gaskets, and a drain channel in the head plate surrounding the tappet in rear of the rear gasket, said drain channel having` an outlet port.

In testimony whereof, I aiiix my signature in the presence of two witnesses.

WILLIAM A. Sli/HTH.

Witnesses N. P. ALBRIGHT, R. G. DAvIs. p u 

